3(2H)-Pyridazinone, 4,5-dihydro-6-(4-propoxyphenyl)- 39496-54-3 4,5-Dihydro-6-(4-propoxyphenyl)-3(2H)-pyridazinone 6-(p-Propoxyphenyl)-4,5-dihydro-3(2H)-pyridazinone